During the fight over his family separation policy, President Donald Trump repeatedly argued that it was the only alternative to simply letting parents caught crossing the border go free. Now that he’s ended the policy, the Trump administration is pursuing another option: holding families together in detention centers. But immigrant advocates, who note that approach has already faced successful legal challenges in the past, argue that there are other alternatives that the Trump Administration isn’t considering, including one program with an extremely high success rate that Trump already ended. “Alternatives to detention make much more sense than detention,” says Katie Shepherd, the national advocacy counsel for the Immigration Justice Campaign. One option is to use a combination of GPS tracking and home visits to keep tabs on immigrants who have been picked up, allowing them to stay out of detention while their case works through the legal system. That program is dramatically cheaper, costing around $4.50 per day, according to a Department of Homeland Security estimate, compared to the $134 per day it costs to hold an adult in immigrant detention.